>
> Speaking of mount options, any of you with an handy Linux box, please answer
> this one:
> How does Linux respond when asked to execute an executable with suid bit on,
> but when on a nosuid-mounted filesystem?
> Is it running with the uid of the executing user? Not running at all? If not
> running, is it -EACESS or -EPERM?
> What about sgid?
>
Runs as the executing user. The relevant snippet from fs/exec.c:
if(!(bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)) {
/* Set-uid? */
if (mode & S_ISUID)
bprm->e_uid = inode->i_uid;
/* Set-gid? */
/*
* If setgid is set but no group execute bit then this
* is a candidate for mandatory locking, not a setgid
* executable.
*/
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP))
bprm->e_gid = inode->i_gid;
}
Alon
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